>>> import pygit2
>>> import shutil
>>> repo=pygit2.Repository(r'C:\TestRepo')
>>> shutil.copyfile(r'C:\TestRepo\.git\index',r'C:\TestRepo\.git\temp-index')
'C:\\TestRepo\\.git\\temp-index'
>>> index=pygit2.Index(r'C:\TestRepo\.git\temp-index')
>>> repo.index=index
Traceback (most recent call last):
  File "<python-input-8>", line 1, in <module>
    repo.index=index
    ^^^^^^^^^^
AttributeError: property 'index' of 'Repository' object has no setter
>>>